Integrated detonator delay circuits and firing console

• US 4,674,047 A
• Filed: 01/31/1984
• Issued: 06/16/1987
• Est. Priority Date: 01/31/1984
• Status: Expired due to Fees

• Current Assignee: Curators of the University of Missouri (University of Missouri)
• Original Assignee: Curators of the University of Missouri (University of Missouri)
• Inventors: Tyler, Lawson J., Worsey, Paul N.
• Primary Examiner(s): Gruber, Felix D.
• Application Number:
  US06/575,324
• Time in Patent Office: 1,232 Days
• Field of Search: 364/423, 235/400, 102/200, 102/206, 102/215, 102/217, 102/218, 102/219, 102/220, 340/825.31
• US Class Current: 89/28.05
• CPC Class Codes: F42B 3/122 Programmable electronic delay initiators
• CPC Class Codes: F42D 1/055 specially adapted for firing multiple charges with a time delay

Abstract

A detonation system for use with supply of electrical energy has user operable firing console for selectably transmitting unit identification information, firing delay time information and selections from a command set including Output, Delay, Fire (Time), Abort, Power Up (Arm), Input, and Store. The console displays responses or information digested from responses by electrical delay detonators to the commands. The detonators have explosive, a capacitor for storing energy from the supply to set off the explosive, circuitry for charging the capacitor from the supply and transferring the energy from the capacitor to the explosive in response to first and second signals generated in response to the commands. Each detonator can be programmed with a unique identification number and delay time. The time base in each detonator can be compensated so that errors in the time base are obviated so as to achieve the correct delay. Security code circuitry and software are described so that each detonator can only be set off by authorized users.

Claims

1. Electronic apparatus for use with a capacitor, an explosive, a supply of electrical energy, and a firing console for transmitting information including commands and a firing delay time, the apparatus comprising:

means for storing an electrical representation of the firing delay time supplied from the firing console, for transmitting the stored firing delay time representation to the firing console in response to a first command supplied from the firing console, for supplying a first signal in response to a second command from the firing console, and for supplying a second signal as soon as a time interval, commencing on a third command from the firing console, has elapsed, which time interval is substantially equal to the stored firing delay time; and

means for charging the capacitor from the supply in response to occurrence of the first signal and for transferring electrical energy from the capacitor so charged to the explosive thereby to fire the explosive in response to occurrence of the second signal.

2. Electronic apparatus as set forth in claim 1 wherein the storing and transmitting means comprises means for also terminating the first signal in response to a fourth command from the firing console prior to the second signal being supplied and causing stored electrical energy in the charging and transferring means to be dissipated, whereby the apparatus is disarmed.

3. Electronic apparatus as set forth in claim 1 wherein said storing and transmitting means comprises microcomputer means having a processor means, memory means, serial interface means for communicating with the firing console, and interface means for communicating the first and second signals to the charging and transferring means.

4. Electronic apparatus as set forth in claim 1 wherein said storing and transmitting means comprises:

serial interface means for communicating with the firing console;

means for decoding the commands;

down counter means; and

logic circuit means responsive to the means for decoding the commands for enabling the delay storing means, the serial interface means, and the down counter means and for supplying the first and second signals.

5. Electronic apparatus as set forth in claim 1 wherein said storing and transmitting means includes means operable prior to the second signal being supplied for also storing a code identifying the apparatus as a unit, for comparing information transmitted from the firing console with the unit identifying code, and for responding to the first command from the firing console only when the first command from the firing console is accompanied by information which matches the stored unit identifying code.

6. Electronic apparatus as claimed in claim 1 wherein said storing and transmitting means comprises means for also responding to a fourth command from the firing console so as to ascertain the actual time which will elapse if the third command were to be given.

7. Electronic apparatus as set forth in claim 2 wherein said terminating and causing means comprises first switching means responsive to the termination of the first signal for disconnecting the capacitor from the supply and second switching means responsive to the termination of the first signal for subsequently shorting the capacitor.

8. Electronic apparatus as set forth in claim 1 wherein the storing and transmitting means includes means operable prior to the second signal being supplied for also decoding the transmitted information from the firing console into a security portion and into a command portion and for preventing the second signal unless the security portion matches a predetermined code.

9. Electronic apparatus as set forth in claim 1 wherein said charging and transferring means comprises electrical leads to the explosive and switching means for shorting the electrical leads except upon the occurrence of the second signal.

10. Electronic apparatus as set forth in claim 9 wherein said charging and transferring means further comprises second switching means for shorting the capacitor until the occurrence of the first signal and third switching means responsive to the second signal for connecting the charged capacitor to the electrical leads.

11. Electronic apparatus as set forth in claim 10 wherein said charging and transferring means further comprises two conductors across which said second switching means is connected and said third switching means includes two field effect transistors having respective gates connected together and supplied with the second signal and wherein said field effect transistors are connected in series with the two conductors respectively to said first-named switching means.

12. Electronic apparatus as set forth in claim 1 wherein said charging and transferring means comprises switching means for shorting the capacitor until the occurrence of the first signal.

13. Electronic apparatus as set forth in claim 1 wherein said charging and transferring means includes means for producing a not-ready signal until the capacitor is charged, and said storing and responding means comprises means responsive to the not-ready signal for preventing the second signal until the capacitor is charged.

14. Electronic apparatus as set forth in claim 13 wherein said charging and transferring means further comprises switching means responsive to the first signal for admitting the electrical energy from the supply to the capacitor.

15. Electronic apparatus as set forth in claim 14 wherein said charging and transferring means further comprises a diode bridge rectifier having input leads for connection to the supply and output lines connected by said switching means to the capacitor.

16. Electronic apparatus as set forth in claim 15 wherein said switching means further comprises two field effect transistors having respective gates connected together and supplied with the first signal and wherein said field effect transistors are connected in series with the bridge rectifier output lines respectively.

17. Electronic apparatus as set forth in claim 1 wherein said charging and transferring means includes first switching means for shorting the capacitor until the occurrence of the first signal, second switching means having two conductors for admitting the electrical energy from the supply and responsive to the first signal for connecting each conductor to the capacitor, and means for producing a not-ready signal until the capacitor is charged, said storing and responding means comprising means responsive to the not-ready signal for preventing the second signal until the capacitor is charged, and said charging and transferring means further includes electrical leads to the explosive, third switching means for shorting the electrical leads except upon the occurrence of the second signal and fourth switching means responsive to the second signal for connecting the electrical leads to the charged capacitor. pg,54

18. Electronic apparatus as set forth in claim 1 wherein said storing and transmitting means comprises means operable prior to the second signal being supplied for also storing a code identifying the apparatus as a unit, for comparing information transmitted from the firing console with the unit identifying code and for supplying the first signal in response to the second command from the firing console only when the second command from the firing console is accompanied by information which matches the stored unit identifying code.

19. An electronic delay detonator for use with a supply of electrical energy and a firing console for providing commands and a firing delay time, the electronic delay detonator comprising:

a capacitor;

an explosive; and

electronic apparatus including;

means for storing an electrical representation of the firing delay time supplied from the firing console, for transmitting the stored firing delay time representation to the firing console in response to a first command supplied from the firing console, for supplying a first signal in response to a second command from the firing console, and for supplying a second signal as soon as a time interval, commencing on a third command from the firing console, has elapsed, which time interval is substantially equal to the stored firing delay time; and

means for charging the capacitor from the supply in response to occurrence of the first signal and for transferring electrical energy from the capacitor so charged to the explosive thereby to fire the explosive in response to occurrence of the second signal.

20. An electronic delay detonator as set forth in claim 19 wherein said storing and transmitting means comprises means for also transmitting to the firing console a signal indicating whether the capacitor is charged.

21. An electronic delay detonator as set forth in claim 19 wherein said storing and transmitting means comprises a complementary metal oxide semiconductor circuit capable of operating under power from the capacitor during the time interval after the third command from the firing console.

22. An electronic delay detonator as set forth in claim 19 wherein the apparatus further comprises a pair of conductors and means for coupling both the charging and transferring means and the storing and transmitting means to the pair of conductors whereby the apparatus is externally connectable to the supply and to the firing console by the pair of conductors.

23. An electronic delay detonator as set forth in claim 19 wherein the charging and transferring means includes

means for igniting the explosive upon receiving electrical energy from the capaitor;

and

means responsive to the second signal for coupling said capacitor to the igniting means whereby the detonator is fired when the second signal occurs.

24. An electronic delay detonator as claimed in claim 19 wherein the detonator further comprises means for isolating the detonator from high voltages and transients, whereby protection from electrical interference is obtained.

25. A detonation system for use with a supply of electrical energy comprising:

user operable firing console means for selectably transmitting unit identification information, firing delay time information and selections from a command set including at least first, second and third commands, and for displaying responses to at least one of the commands; and

a plurality of units of apparatus each comprising in physical association;

an explosure;

means for storing a code identifying the apparatus as a unit, for storing an electrical representation of the firing delay time information supplied from the firing console, for transmitting the stored firing delay time representation to the firing console in response to the first command supplied from the firing console only when the firing console has previously sent unit identification information matching the stored code, for supplying a first signal in response to the second command from the firing console, and for supplying a second signal as soon as a time interval, commencing on the third command from the console, has elapsed, which time interval is substantially equal to the stored firing delay time; and

means for temporarily storing electrical energy from the supply in response to occurrence of the first signal and for transferring stored electrical energy to the explosive thereby the fire the explosive in response to occurrence of the second signal.

27. A detonation system as set forth in claim 25 wherein each unit of apparatus further comprises a pair of conductors connected in parallel to each said pair of conductors in all of the other said units and connected to the firing console, and means for coupling both the charging and transferring means and the storing and transmitting means in each unit to the pair of conductors.

28. A detonation system as set forth in claim 25 wherein each storing and transmitting means comprises means for also terminating the first signal in response to a fourth command from the firing console prior to the second signal being supplied and thereby causing any electrical energy in each said energy storing and transferring means to be dissipated so that the units of apparatus are disarmed.

29. A detonation system as set forth in claim 25 wherein each said storing and transmitting means comprises means for also transmitting to the firing console a signal indicating whether any electrical energy is stored in the energy storing and transferring means.

30. A detonation system as set forth in claim 25 wherein each said storing and transmitting means comprises a complementary metal oxide semiconductor circuit capable of operating under power from the energy storing and transferring means during the time interval commencing on the third command from the firing console.

31. A detonation system as set forth in claim 25 wherein each said storing and transmitting means comprises:

serial interface means for communicating with the firing console;

means for decoding the commands;

down counter means; and

logic circuit means responsive to the means for decoding the commands for enabling the delay storing means, the serial interface means, and the down counter means and for supplying the first and second signals.

32. A detonation system as set forth in claim 25 wherein each said storing and transmitting means comprises microcomputer means having a processor means, memory means, serial interface means for communicating with the firing console, and interface means for communicating the first and second signals to the charging and transferring means.

33. A detonation system as set forth in claim 25 wherein said firing console means includes means operable prior to the second signal being supplied for storing a code including a prestored normally user-inaccessible code portion and means for transmitting to the units one or more of the selections from the command set with the user-inaccessible code portion and the unit identification information.

34. A detonation system as set forth in claim 32 wherein said means for storing and transmitting also comprises means for decoding the user-inaccessible code portion from said firing console means and for supplying the second signal in response to the third command only if the user-inaccessible code portion matches a predetermined code.

36. An electronic circuit as set forth in claim 34 wherein the generating means comprises means for also storing a firing delay time representation and transmitting the stored firing delay time representation to the firing console.

26.

35. An electronic circuit for use in an electrical delay detonation system including a firing console for sending information transmissions and a detonator with means for firing the detonator in response to occurrence of a signal to fire, the electronic circuit comprising:

means for decoding the transmissions from the firing console into a security portion and into a command portion; and

means for generating the signal to fire in response to one of the transmissions from the firing console only if the security portion of said one transmission matches a predetermined code.

37. An electronic circuit as set forth in claim 35 wherein the transmitting of the stored firing delay time representation is delayed subsequent to the decoding of the command portion by a predetermined time interval related to the firing delay time, whereby error in the electronic circuit is made detectable by the firing console.

39. A firing console as set forth in claim 37 which further comprises means for temporarily storing responses from individual ones of the electrical delay detonators to the selectable command.

40. A firing console as set forth in claim 37 which further comprises means for displaying responses from individual ones of the electrical delay detonators to the selectable command.

41. A firing console as set forth in claim 37 wherein the selectable command is a command for a detonator to respond with a time delay stored in the detonator.

42. A firing console as set forth in claim 37 wherein the selectable command is a command for a detonator to respond with at least one pulse, and the firing console further comprises means for measuring a time interval between the end of the command and the at least one pulse, thereby to ascertain the actual delay of the detonator.

43. A firing console as set forth in claim 37 wherein the selectable command is a command for arming at least one of the detonators.

44. A firing console as set forth in claim 37 wherein the selectable command is a command for aborting arming at least one of the detonators.

45. A firing console as set forth in claim 37 wherein the selectable command is a command for storing time delay information in at least one of the detonators.

46. A firing console as set forth in claim 37 wherein the selectable command is a command for firing at least one of the detonators.

47. A firing console as set forth in claim 37 wherein the selectable command is a command for storing the user- selectable code portion in one of the delay detonators.

38. A firing console for operation in combination with a plurality of delay detonators, the firing console comprising:

means for storing a code including a prestored normally user-inaccessible code portion; and

means for transmitting a selectable command together with the code to the delay detonators, the code as transmitted including the user-inaccessible code portion and a userselectable code portion indicative of an individual one of the electrical delay detonators for which the selectable command is intended.